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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,039,074,787 | 0 | 18,990,406 |
| 2006 | $1,051,984,646 | 0 | 23,802,746 |
| 2007 | $990,992,892 | 0 | 19,662,634 |
| 2008 | $1,386,163,931 | 0 | 27,773,117 |
| 2009 | $575,247,988 | 0 | 17,498,241 |
| 2010 | $648,357,118 | 0 | 18,513,821 |
| 2011 | $390,823,863 | 0 | 14,712,815 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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